Bin conveyer



March 19, 1940. c, CARTER 7 2,194,006

BIN CONVEYER Filed Sept. 27, 1937 2 Sheets-Sheet 1 //\/Z/E/\/ 70 H.C. CARTER Match 19, 1940. g, CARTER 2,194,006

BIN CONVEYER Filed Sept. 27. 1937 2 Sheets-Sheet 2 Z/VMEA/TU X H. c. CAR-(E5 Patented Mar. 19, 1940 BIN CONVEYER Haskell 0. Carter, Portland, reg., assignor to Iron Fireman Manufacturing Company, Portland, Oreg.

Application September 2'1, 1937, Serial No. 165,853

8 Claims.

This invention relates generally to underfeed stokers, and particurrly to stokers wherein the fuel is drawn from a sto age bin as distinguished from the usual form of hopper of very limited capacity.

The main object of this invention is. the provision of an exceedingly simple and eflicient form of conveyer which adapts itself to use in stokers wherein one coal worm is employed to draw coal from a bin and deliver it to a second worm which carries the coal on to the retort. The second object is to provide an, improved form of coal transferring and power applying mechanism between the adjacent ends of the coal feeding worms.

The third object is to improve the form of bin conveyer illustrated in my Patent 2,027,958, dated January 14, 1936, by reducing the vertical height of the transfer mechanism and rendering more positive the transferring action when used in connection with wet coals.

I accomplish these and other objects in the manner set forth in the following specification as illustrated in the accompanying drawings, in which:

Fig. l is a fragmentary perspective view show ing the complete installation.

Fig. 2 is a fragmentary view showing the perspective view of the transfer mechanism with the casing removed.

Fig. 3 is a section taken along the line 33 in Fig. 2..

Fig. 4 is a view of the end of the coal worm drive with the cover pipe removed.

Fig. is a section taken along the line 55 in Fig. 3.

Fig. 6 is a section taken along the line 6-6 in Fig. 3.

Fig. '1 is a section taken along the line 11 in Fig. 3.

Similar numerals refer to similar parts throughout the several views.

Referring'to the drawings there is shown a furnace III to which coal is to be delivered from bin II. In the furnace I0 is disposed a fire pot I2 and retort base |3 which contains a plenum chamber to which air is delivered through a duct 4 from a fan IS. The fan I5 is driven by the motor l6 through the belt H which passes around the motor sheave l8 and the fan sheave l9.

Disposed between the furnace l0 and the bin is a turret base into which extends the coal feeding worm 2| which is disposed within the coal feeding tube 2|A which projects into the retort base I3. The worm 2| is provided on'one end with the sprocket wheel 22 which meshes with a chain 23 which passes around the sprocket wheel 24 which in turn is secured on the drive shaft 25. The drive shaft 25 extends into the transmission casing 26 from which it is driven by gearing not shown.

It is desirable to provide a cover plate 21 for the sprocket wheels 22 and 24. The upper side 28 of the turret base 20 is circular in form and has mounted thereon a turret 29 whose lower end 30 forms a cover for the base 20 and is secured thereto by means of the clamps 3|. The

turret 29 is provided with an inclined opening 32 1 having a curved flanged inlet opening 33. i

The coal conveying tube 34 which extends to the coal bin through the clean-out box 35 is held in its proper relation to the turret 29 by means of the bolts 36.

Also mounted in the turret 29 is the vertical shaft 31 whose lower end has secured thereon an agitating arm 38. The upper end of the turret 29 is provided with a recess 39 through which the shaft 31 extends. A short shaft 40 also journals in the turret 29 and has secured on one end thereof a universal coupling 4| which is connected to the inclined coal conveying worm 42 which is disposed within the tube 34. The shaft 40 has also secured thereon a bevel gear 43 which meshes with the bevel pinion 44 which is secured on the shaft 31. The pinion 45 is also secured on the shaft 31, and meshes with the bevel gear 46 whose shaft 41 journals in the turret head 48 which is rotatable with relation to the turret 29 but may be held in any desired position by means of the clamps 49. The shaft 41 is also provided with a sprocket wheel 59.

On the shaft 25 is secured a sprocket wheel 5| and the chain 52 passes around the sprocket wheels 50 and 5|. It is desirable to provide an idler sprocket 53 for the purpose of tightening the chain 52.

The operation of the device is as follows:

When the stoker is installed the relative positions of the furnace I0 and the bin II are immaterial since the angularity between the tubes 2 IA and 34 may be varied by loosening the clamps 3| and 49. Once the parts are in position the clamps 3| and 49 are secured.

When the stoker is operated the motor l6 causes the fan l5 to be operated and the drive shaft 25 to rotate and through the chain 23 to rotate the worm 2|. to drive the shaft 31 through the chain 52 and bevel pinion 45 and gear 46 while the pinion 44 The shaft 25 also serves through the gear 43 drives the inclined coal conveying worm 42 causing coal to move from the bin ll into the inclined opening 32 which communicates with the inlet end of the worm 2|.

A dry and clean coal will ordinarily pass through the opening 32 but very moist coals or coal with a large percentage of dirt will be apt to arch over the worm 2| within the opening 32. It is for this purpose that I have provided the agitating arm ll. With this construction it is practical to feed coal with a higher moisture content than would otherwise be possible.

I claim:

1. A bin conveyer having in combination a trough, an inclined neck mounted over said trough and communicating therewith, a coal feeding worm within said trough, a tube communicating with the upper end of said neck, a worm within said tube, a driving connection on the upper side of said neck for rotating said last mentioned worm, an adjustable connection between said inclined tube and neck whereby said tube can be selectively fixed with relation to said trough, and an agitator arm at the lower end of said neck on the upper side of said trough.

2. A bin conveyer having in combination a horizontal'trough, a coal feeding worm disposed within said trough having means for rotating same for the purpose of conveying fuel from said trough to a stoker retort, a sloping fuel conveying worm having its upper discharge end disposed above said trough, an inclined neck communicating between the upper end of said sloping worm and said trough, gearing on the upper side of said neck for driving said sloping fuel conveying worm, a distributor arm actuated by said gearing adapted to sweep across the lower end of said neck, said gearing having a pivotal axis passing substantially through the intersection of the axes of said neck and trough.

3. A bin conveyer for transporting coal from a bin to the retort of an underfeed stoker having in combination a horizontal coal tube communicating with the retort and having a worm therein extending into said retort, a sloping coal tube disposed above said horizontal coal tube, an inclined neck communicating between the upper end of said sloping coal tube and the horizontal coal tube, a worm within said sloping coal tube extending into said bin, a drive gear on the upper end of said neck having a vertical pivotal axis passing substantially through the intersection of the axes of said neck and the horizontal tube, said neck and horizontal coal tube being capable of a limited relative rotation, and an agitator disposed between said worms adapted to sweep across the path of communication between the inclined neck and the horizontal coal tube.

4. A bin conveyer consisting of a coal feeding worm adapted to feed coal to a retort, a coal elevating worm adapted to draw coal from a bin and discharge it above the loading end of said first mentioned worm, a turret forming an adjustable' hinged connection between the two worms, said turret having a passageway therethrough by means of which coal may fall from one worm to the other and an arm revolvable about the turret axis for agitating the coal at the loading end of the other worm.

5. The combination of an inclined coal elevating worm, a coal conveying worm having its loading end disposed below the upper end of said elevating worm and spaced therefrom, a turret forming an adjustable coal conveying connection between the adjacent ends of said worms, said turret having a head thereon which is revolvable with relation to the turret, means for driving said inclined worm through said turret head, and an agitator operated by said driving means adapted to operate between the adjacent ends of the two worms.

6. A bin conveyer having in combination a trough, a worm within said trough, a turret forming a cover for said trough, a drive mechanism mounted on said turret, an inclined coal conveying worm supported by said turret and driven from said drive mechanism, said turret having a a passageway therein communicating between the adjacent ends of said worms and an agitator arm disposed between said turret and trough adapted to sweep across the lower end of the turret passageway.

'7. In a device of the class described the combination of a trough containing a coal feeding worm, a turret revolvably mounted on said trough, a turret head revolvably mounted on said turret, an inclined coal conveyer adjustably attached to said turret, said turret having an inclined passageway formed therein communicating between said worms, means for driving said inclined worm from said turret head through said turret and a revolvable arm for agitating coal passing through said passageway.

8. In a device of the class described the combination of a trough, a horizontal worm disposed within said trough, a turret mounted over said worm having a coal passageway formed therethrough and discharging into said trough, a coal elevating worm adapted to discharge coal into said passageway, a vertical shaft along the axis of said turret having an agitator arm at the lower end thereof, means for fixing the angular relation between said turret and trough, a head rotatably mounted on said turret through which power may be delivered to the vertical shaft, a chain drive for applying power to said turret. gearing driven by said vertical shaft for rotating said elevating worm and a drive shaft on the side of said trough for supplying power to said turret head and to said first mentioned worm.

HASKELL C. CARTER. 

